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The horizontal fraction bar was introduced by the Arabs.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.

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All adults should have their cholesterol levels checked once every 5 years. During 2009–2010, 69.4% of Americans age 20 and older reported having their cholesterol checked within the last five years.

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